Natural Science. Although I don't know whether paleontology counts as a nautral science.
Oxygen is the most common element which Sulfur makes covakent bonds with as in SO3 or H2SO4
The answeris c, chemicalchange because the atoms in woodand oxygen are rearranged.
It looks like we are solving for a pressure. All that is required is some algebraic manipulation to find our pressure in mmHg.
Given:
(5.0 m³)(7.5 mmHg) = (P)(4.0m³)
Multiply:
37.5 = 4.0P
Divide:
9.375 = P
P = 9.4 mmHg (remember sig figs)
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Answer:</h3>
9.4 mmHg